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Howto setup a haproxy as fault tolerant / high available load balancer for multiple caching web proxies on RHEL/Centos/SL

This howto will show you how to setup a haproxy with corosync and pacemaker on RHEL6, Centos6 or SL6 as TCP load balancer for multiple HTTP proxies. It will be high available by itself and also recognize if one proxy does not accept connections anymore and will remove it automatically from the load balancing until it is back in operation.